REVlite foam in the midsole cushioning helps energize each step while the sleek, bootie-like design wraps your foot like a second skin. Everything you need for speed is here and nothing you don't, removing every obstacle in your way to your next personal best. Awarded “Best Debut” by Runner’s World magazineNamed “Best in Class” Light Trainer/Racer” by Triathlete Magazine, November 20156 mm drop: due to variances created during the development and manufacturing processes, all references to 6 mm drop are approximateBootie constructionDeconstructed heel counterNo-sew material applicationPodular blown rubber outsoleREVlite midsole foamRunner's World is a registered trademark of Rodale, Inc. All rights reserved.